Silex References... https://speakerdeck.com/hhamon/designing-rest-api-with-silex

gistfile1.php

<?php

/*
 * ROUTING
 */

$app->get('/archive/{year}/{month}', function($month, $year) {
  // ...
})

->bind('archives')            // Route name

->value('year', date('Y'))    // Default parameter value
->value('month', date('m'))

->assert('year', '\d{4}')     // Parameter format
->assert('month', '\d{2}');